Introduction - If you have any usage issues, please Google them yourself
1. To achieve circular double-linked list of basic operations of the algorithm, complete the following functions: (1) initialize the circular doubly linked list h (2) followed by the end of interpolation into a, b, c, d, e element (3 ) circular double-linked list output h (4) the length of the output circular doubly linked list h (5) to determine whether the circular double-linked list is empty h (6) circular double-linked list output of the first three elements h (7) output elements a, location (8) in the first four elements of f elements into position (9) circular double-linked list output h (10) to delete the first three elements h (11) circular double-linked list output h (12) release cycle double-linked list h.